Five challenges to psychologists are described; and it is argued that meeting them can contribute solutions to pressing, difficult criminal justice problems. The needs discussed are: to develop an integrated theoretical framework, to define person classifica tions with demonstrable relevance to treatment alternatives, to develop new treatment and control strategies and test their effect iveness, to develop — in every social agency responsible for crime and delinquency programs - adequate information bases to permit the monitoring of program effectiveness, and to devise effective means for research utilization.